Species [ var. simonyi ]: Cell body 19-24 μm long, 18-25 μm (excluding spines), isthmus 6-7.5 μm wide, 6 short spines at each side of trianglur semicell in top view [ var. sparse-aculeatum (Schmidle) Hirano ]: Cell body 19.6-23.7 μm long (excluding spines), 19.6-19.8 μm wide (excluding spines), isthmus 5.6-7.7 μm wide, spines equal in length (Illustrations of The Japanese Fresh-water Algae, 1977)

31 μm 63 μm 94 μm; x 640

Staurastrum simonyi var. sparse-aculeatum (Schmidle) Hirano, cell body 24 μm long, 26 μm wide, L/W=0.9, isthmus 8 μm wide, x 640, No.3, a small marsh, East of Tojuro, Azuma mountains, Kitashiobara village, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.3, a small marsh, East of Tojuro, Azuma mountains, Kitashiobara village, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii